Vertical axis ring and wheel mill



Aug. 14, 1951 M. G. CLAY ET AL 2,564,096

VERTICAL AXIS RING AND WHEEL MILL Filed Nov. 12, 194e S sheets-sheet 1 Jy 09M i Aug- 14, 1951 M. G. CLAY ETAL 2,564,096`

VERTICAL AXIS RING AND WHEEL MILL Filed Nov. vl2, 1946 5 Sheets-Sheet 2 y Aug. 14, 1951 M. G. CLAY ETAL 2,564,096

VERTICAL AXIS RING AND WHEEL MILL Filed Nov. 12, 1946 s shwrs-sheet s L Aug. 14, 1951 M. G. CLAY ETAL 2,564,096

VERTICAL AXIS RING AND WHEEL MILL Filed Nov. 12, 194e s sheets-sheet 4 Aug 14, 1951 M'. G. CLAY ETAL 2,564,096

VERTICAL AXIS RING AND WHEELMILL.

Filed Noy. l2, 1946 6 Sheets-Sheet 5 Aug. 14, 1951 M. G. CLAY ET AL 2,564,096

VERTICAL AXS RENG AND WHEEL MILL Filed Nov. 12, 194e 6 SheetS-Sheet 6 22-l i Jl WWW/* Mame/:YG C/ iv A JScH/v/ n/v i JZ Patented ug. 14, 1951 UNITED VSTATES PATENT OFFICEg VERTICAL AXIS RING AND WHEEL MILL Murray G. Clay, River Forest, and Chester J.

Scanlan, Chicago, I ll., assignors, by mesneas*- signments, to Pettibone Mulliken'Corpor-ation, a corporation of Delaware Application November 12, 1946, Serial'ltlo.y 709,162

14 Claims. (Cl. 241-66) The present invention relates generally to IQ'- tary mills. More particularly the `invention re,- lates to that type of mill which is primarilyy designed vand adapted vto vprocess different materials by mixing them and com pressing them, and as its principal components or l,parts comprises: (1) a bowl shaped receptacle which is adapted to receive and contain a batch of the materials to be processed and embodies a circular bottom wall and a cylindrical upstanding sidewall; (2) a rotary horizontally extending crosshead which is disposed in, and extends across the;l central portion of,'the receptacle and is connected for drive by .power means such, for example, as an electric motor; (3) a plurality of horizontally extending Wheelswhich are rotatably mounted on upstanding-.axles on the crosshead and are arranged so thatin response todrive of the crosshead they travel in a circular course or path around the receptacleinterior and effect processing of the materials by squeezing them against the side Wall ofthe receptacle; (4) Scrapers which are mounted-on,and rotate with, the crosshead and are arranged so that in connection with drive of the latter certainthereof serve to scrape the peripheries ofthe wheels and others serve to scrape the squeezed or processed materials from the portion of the receptacle side wall about which the wheels travel; and v(5) plows which are mounted on, and are connected for travel with, the crosshead and are arranged so that they deect scraped materials upwards into the path of travel of the wheels.

One object of the invention is to provide a mill of this type which is generally of new, improved construction and effectively and eiciently ful- `fills its intended purpose and ischaracterized by the factl that the parts are so designed, constructed and arranged that it has special usefulness or utility in mixing resinous material with i filler material and at the same time compressing themixture to the end that the latter,"in'con nection with a single milling operation, is so processed that it is in condition to beused, 'after grinding thereof, to form by molding operation so-called plastic articles.

Another object of the invention is to provide a mill of the last mentioned character in which the axles for the rotary horizontally extending wheels are mounted on, and connectedl to, the crosshead in a novel manner and so that they may be adjusted laterally outwards or inwards inorder to vary, as desired, the .spacing of the wheels with respect to the adjacent portion of the side wall of the bowl shaped receptacle.

Ano-ther object of the invention is to` provide a mill of the type and character under considera- A tion in which the receptacle side wall consists of a plurality of superpOSed, clamped together ringn shaped sections,one of which surrounds and is aligned withthe horizontally extending rotary wheels, is so constructed that it forms -a come paratively thick' track around which the wheels travel in connection with operationof-v the mill; and hasy aroundv its outer Aperp-hery an annular jacket through which may be circulated; either a iiuid heating medium or a liuid cooling mediumi depending upon whether it isdesired to heat' the materials being processed in the mill or to remove and dissipate the heat that is created inconnection with compression--of` the-materials Another object of the invention is to provide a mill of the aforementioned character in which the Scrapers for -thev peripheries of the 'horizontally extending rotary, laterally adjustable'wheels are connected `tothe crossheadin a novel man# ner and'sov that they may bev readily "adjustedto and 'fromfthe wheels in order poperlytoposi'- non them with respect to the iatter.

Anotherob'ject of the' invention is to `provide a mill yof the type yurfider' consideration in' lwhich the `Scrapers for scraping the' portion ofthe re`` Icepta'cle side Wall 'ar'ound which the wheels travel,y and the` plows' for deliecting upwards the scraped materials into" the path ofthe wheels'a're mounted oil'tlie crosshead ina novel manner so that they are readily adjustablein order to conip'ensate forwear. y A further object of theinvention is to provide e mill' 'f *the type, andv Character, yunder ,oonsideftidn, which comprises lnovel meanstforso intro: dwing the leSnOll material into the receptacle in connection with a reoeptacle'ohareine operar tionr that it CQits and becomes4 intimately mixed with the iiller materialwithoutpappreciably `vac'- cumulating on--thebottoml and side Awall of the receptacle- Y .other Objects, ofthe invention and the various advantages and characteristics of the present mill will be apparent fromA a consideration 'of thefol-l lowing ,detailed description.

The invention consists inthe several-nove'Pfea-V tures-Which are hereinafter set -for'th and are more particularly defined -by claims vat thecofnclusion hereof.

Inthedrawings which accompany 'and form a part of this"`specica`tion or vdisclosure andl whichlike numerals of reference denote jcorre spondinguparts throughout the several views Figure rl isa perspective of a mill embodying ihe invention;

v Figure 2 isa vertical section illustrating in de-f tailthercons'tructionfand design ofthe receptacle and showing the manner in whichthe rotary horizontally' extending crosshead in-the central por; tion of the receptacleis mounted and connected fordrive;

Figure 3 is-a horizontal section taken on the linef'a of 'Figure 2 and showing in detail--the' atelroe positioning and arrangement of the crosshead, wheels, scrapers and plows; y

Figure 4 is an enlarged vertical section of the crosshead, illustrating in detail the manner in which the axles for the wheels are so mounted on, and connected to, the crosshead that they may be 'laterally adjusted outwards and inwards in order 'to vary the spacing of the wheels with respect to the cylindrical side wall of the receptacle; Figure 5 is a vertical section taken on the line 5 5 'of Figure 3 and showing the arrangement Aand design of the means for introducing the resinous material into the receptacle in connection with charge of the receptacle;

Figure 6 is an enlarged view partly in side elevation and partly in section, illustrating in detail the manner in which the Scrapers for the wheels and the scrapers for the receptacle side wall are adjustably mounted with respect to the horizontally extending rotary crosshead;

Figure 7 is a horizontal section on the line 1-1 of Figure 2;

Figure 8 is a perspective of one of the wheel Scrapers;

Figure 9 is a perspective of one of the Scrapers for the receptacle side wall;

Figure l is a horizontal section on the line III- I0 of Figure 2;

Figure 11 is an enlarged side elevation of one of the plows for deiiecting the materials upwards into the path of the rotary wheels; and

Figure 12 is a side view of the scraper which is located beneath the crosshead and serves to scrape the sleeve which extends between the crosshead and the receptacle bottom wall and surrounds the upper end of the vertically extending shaft for driving the crosshead. The mill which is shown in the drawings constitutes the preferred form or embodiment of the invention and is essentially an instrumentality or apparatus for processing different materials by mixing and compressing them in order, preparatory to use, to produce a homogeneous mixture with less or reduced volume. Whereas the mill may be used so to process various materials it is primarily designed, constructed and adapted to mix resinous material with iiller material and at the same time compress the filler material so as to produce by a single operation a product which may be molded, after grinding, to form plastic items or objects. As its principal parts the mill comprises a horizontally elongated housing-like supporting structure I5, a bowl shaped receptacle I6, a horizontally extending rotary crosshead I1, a pair of horizontally extending rotary wheels I8, a pair of wheel Scrapers I9, a pair of receptacle Scrapers 20, a pair of plows 2l, a sleeve scraper 22, a chute 23 for introducing the ller material into the receptacle, andv a pipe system 24 for introducing the resinous material into the receptacle.

The supporting structure I is adapted to rest on the floor of the establishment in which the mill is used. It is hollow and, as best shown in Figure 1, embodies at one end thereof a at horizontal top wall 25 and at its other end an upstanding substantially cylindrical shell 26. The upper end of the shell is partially closed by way of a horizontal crosswall 21. The latter is circular and has its outer marginal portion suitably and fixedly secured to the upper end or marginal portion of the shell 26. Preferably the crosswall 21 is in the form of a one-piece metallic casting. The centra1 portion of the crosswall 21 is provided with an integral, vertically extending tubular 4 member 28. This member is so proportioned and arranged that its upper end projects above the crosswall and its lower end projects beneath the crosswall. A plurality of upper webs 29 and a plurality of lower webs 30 serve to reeniorce the crosswall 21. The upper webs 29 are connected to, and radiate from, the portion of the tubular member 28 that is directly above the crosswall, and the lower webs 30 are connected to, and project radially outwards from, the portion of the lower end of the tubular member that is directly beneath the crosswall. The bottom marginal portions of the upper webs 29 and the top marginal portions of the lower webs 3U are formed integrally with the adjacent portions of the crosswall 21. The side portions of the supporting structure I5 are provided with openings whereby access may be had to the interior of the supporting structure as shown in Figure l, such openings are normally closed by panels 3| which are removably mounted in place.

The receptacle I6 is located over the substantially cylindrical shell 26 of the supporting structure I5 and has the crosshead I1, the wheels I8 and the various Scrapers and plows disposed therein. It is adapted to have batches of the illler and resinous materials to be processed introduced successively into it as hereinafter described more in detail, and consists of a circular bottom wall 32 and an upstanding cylindrical side wall 33. The bottom wall 32 is formed separately from the side wall of the receptacle and is preferably in the form of a one-piece casting and embodies at its outer margin an integral annular flange 34 and has in its central portion a circular hole 35 through which the upper end of the tubular member 28 extends (see Figure 2). The annular flange 34 on the outer marginal portion of the bottom wall 32 rests on the outer marginal portion of the crosswall 21. The bottom wall 32 is secured in place over the crosswall 21 by way of vertically extending bolts 36 which, as shown in Figure 2, extend upwards through the outer marginal portion of the crosswall 21 and into internally threaded sockets in the annular flange 34 on the circular bottom wall of the receptacle. The receptacle side wall 33 is of sectional design or construction and consists of a lower ring shaped section 3'I and an upper ring shaped section 38. The lower section 33 rests on the upper portion of the annular ange 34 on the ,receptacle bottom wall 32 and is clamped in place by a plurality of vertically extending bolts 39, the upper ends of which extend through apertured lugs and have polygonal heads for turning purposes, the lower ends of which are screw threaded and nt within internally threaded sockets in lugs 4I. The lugs 4D are Welded or otherwise xedly secured to, and project outwards from, the lower end of the lower section 33 of the receptacle side wall and the lugs 4I are suitably secured to, and project outwards from the outer end or marginal portion of, the substantially cylindrical shell 26 constituting part of the supporting structure I5. rlhe upper ring shaped section 38 of the receptacle side wall has the same internal diameter as the lower section and is arranged in concentric relation with said lower section. It is materially thicker than the lower section, surrounds the horizontally extending rotary wheels I8 and denes a track around which the wheels travel in connection with operation of the mill. Preferably the upper section 38 of the receptacle side wall is formed of steel in order that it is wear resistant. As shown in Figure 2,.'the upper section 36 rests on the kupper end of the lower ring shaped section 33 and is clamped in place by means of vertically extending bolts 42, the lower ends of which extend through apertured vlugs 43 and carry or embody polygonal heads for turning purposes and the upper ends of which are screw threaded and t within internally threaded sockets 44 in the lower end of the upper section 38. The lugs 42 are welded or otherwise xedly secured to, and project outwards from the upper end of, the lower section 33 Vof the receptacle side wall. When it is desired to remove the upper section 33 for repair or replacement purposes thev bolts 42 are removed. Removal of the bolts 42 frees the upper section 38- so that it may be removed vby shifting it upwards with respect to the lower section 3l. The latter section may be removed fromv the bottom wall 32 of the receptacle l5 by removing the bolts 39. Upon removal of the bolts section 3'I is released from clamped relation with the bottom wall 32 and hence may be removed by shifting it upwards relatively to the bottom wall. The upper track forming section 38 is surround-ed by a ring shaped member 45 which is of channel shaped cross section and defines around theV upper'section 38 a circular jacket 45 through which either a uid heating medium or a uid cooling medium may be circulated. As shown in Figures 2 and 5 the ring shaped member y45 comprises a cylindrical web and a pair of inwardly extending annular flanges at the ends of th-e web. The ilanges denne with the web the circular jacket 46 yand have the inner edges thereof welded to the adjacent portions of the outer periphery of the upper section 33 of the receptacle side wall. A supply pipe 4? serves to introduce the heating or cooling medium into the jacket 46 and a diarnetrically opposite` discharge pipe 45 serves to discharge the medium from the jacket after it circulates therethrough. Such pipes are illustrated in Figure 2 of the drawings. If, in connection with operation of the mill, it is desired to heat the materials being processed a uid heating medium, such as steam or hot water, is circulated through the jacket. On the other hand, if it is desired to reduce the temperature of the materials or remove or dissipate the heat that is created in connection with compression of the materials a fluid cooling medium, such as a refrigerant or water, is circulated through the jacket. A horizontally elongated doorway 49 is formed in the low-er section 3l of the receptacle side wall and serves to permit discharge of the materials after processing. This doorway is normally closed by way of a door 5S which is hinged at one end thereof so that it is capable of being swung outwards into an open position. Any suitable mechanism, such, for example, as the toggle linkage shown in Figures 1 and 2, may be utilized to swing the door back and forth between its open and closed positions. It is contemplated that at the conclusion of a processing operation and. while the mill is still in operation the door 51).,will be swung into its open position. When the door is in such position the plows 2 I, as hereinafter described more in detail, operate todischarge the processed materials through the doorway 49. A hood-like deflector 5I is positioned adjacent the doorway and serves in connection with a discharging operation to deflect the dischargedprocessed materials downwards into a. hopper or other receptacle (not shown). The upper end of the receptacle IB is closed by way of a hood 52. The latter consists of a circular top-wall 53` and a depending cylindrical side wall 54. Thev side wall ,54' is imperforate andhas'th sameinternal diameter as, and is arranged in concentric relation with, the receptacle sidewall 33. Y The upper end of the side wall 54 of the hod is connected tothe outer marginal portion of th top wall53 by way yof an angle bartype ring- 55. The lower end'of the hood sideI wall54 is sur-A rounded and reenforced by anexterrially disposed angle bar typering 56 and this has anvoutwardly extending bottom leg which rests on'the upperri'd oftherupper track lforming section 38` ofxfthe receptacle side: wall 331 .and is releasably'clamped in place by means` of anfannular series of: spaced apart clamp plates 5l.. The latter are connected to I'theupper side wall section -38wby vertically en; tending bolts 58 and. arranged so that .certain endsv thereof rest on the bottom leg of the angle bar type ring 56 and the other ends bear against the upper side wall section 33. The bolts 58 extend through apertures in the central portions of the clamp bolts 51- and into internallythreaded sockets or holes in the upper end of said upper side wall section 38.- In order to provide aaccess to the interior of the .bowl shaped receptacle I6 the top wall 53 of the hood is provided'with` a segmentally shaped opening 59-which is normally closed by way of a hinged cover60 (see Figure l). A suction fan (not shown) is connected to With-a draw water, vapor and other gases from the interior of the hood 52Y by way of a vertically extending cylindrical shell BI and a horizontally extending duct 62. The shell 6I restson, and is suitably xedly secured to the central portion of the hood top wall 53 and communicates with lthe interior of the hood by way of a circular hole 63 in said central portion of the-top wall 53:.: The duct 52 extends laterally from the shell 6I and has the receiving end thereof in communication with the shell interior. It is contemplated that the suction fan will `be operated irl-connection with operation of the mill to the end that it will remove from the interiors of the receptacle and hood water, Vapor and other gases.

The crosshead l'I is in the form of a circular plate and is disposedwithin the centraly portion of the interior of the lower section 31 of the receptacle side wall 33. It is spaced a partial distance from the receptacle side wall 32, carries the` wheels I8, the Scrapers I9, 20 and 22 and the plows 2|, and is provided with a centrally dis'- posed, depending drive shaft 64.` The latter, as shown inA Figure 2, extends through the tubular member 28 on the crosswall 2'I at-the upper end of the shell 26 of the supporting structure I5.

r The upper end of the shaft 64 is rotatably -supported by way of a ball bearing I5andv is xedly secured kto the central portion of the crosshead Il by way of vertically extending bolts 66. The outer race of the ball bearing |55l extends around. and is suitably secured within the upper end of, the tubular member 28. The lower end of the drive shaft 54 is rotatably supported by Way of a. ball bearing 61 and is provided with a reduced stem 68 which projects beneath the lower end of the tubular member 28 into the interior 4.of theN shell 26. As shown in Figure 2 the outer race. of the ball bearing G'I extends around and is mount,- ed within the lower end of the tubular member 28. The crosshead I'I is driven by way of an electric motor 69 and a pulley and belt connection 10. The motor 69 is arranged soy that the armature thereof extends vertically. It is mounted on the top wall 25 of the supporting structure I5 and has the lower end of the arma--A ture shaft thereof arranged so that it projects 7 into and is disposed within the interior of the supporting structure. The pulley and belt connection comprises a pulley (not shown) on the lower end of the armature shaft of the motor, a pulley 1I on the lower end of the drive shaft 64 and a plurality of spaced apart endless belts (also not shown) around the two pulleys. When the motor 69 is driven as the result of being supplied with electric current the pulley and belt connection operates through the medium of the shaft 64 to rotate or drive the crosshead I1. As indicated by arrows in Figures 3 and 'l the crosshead is driven in a clockwise direction when viewed from the top. The pulley 1I is disposed and housed within the shell 26 of the supporting structure and has the hub thereof mounted on, and keyed to, the reduced stem 68 of the lower end of the drive shaft 64.

The horizontally extending wheels I8 overlie the crosshead I1 and are positioned one diametrically opposite the other and within the upper track forming section 38 of the receptacle side wall 33. They are located in the same horizontal plane and operate in connection with drive of the crosshead to travel in a circular course or path around the upper side wall section 38 and in conjunction therewith to compress the materials to be processed. Preferably the wheels are formed of steel or other hard wear resistant material and have flat or cylindrical outer peripheries. A pair of vertically extending axles 12 serves rotatably to support the wheels I8. The upper ends of the axles 12 are positioned or disposed concentrically within over-sized circular holes 13 in the central portions of the wheels I8 and embody at their upper extremities screw threaded stems 14. Lower ball bearings 15 and upper ball bearings 16 are interposed between the upper ends of the axles 12 and the central hole defining portions of the wheels I8 permit the wheels to rotate freely with respect to the axles. The inner races of the lower and upper ball bearings are spaced apart by sleeves 11. The inner races of the lower ball bearings abut against upwardly facing annular shoulders T8 on the central portions of the axles 12. Nuts 19 on the externally threaded stems 14 bear against the inner recesses of the upper bearing 16 and serve in conjunction with the shoulders 18 to hold the inner races of the upper and lower bearings and the sleeves 11 between such races in clamped relation. The outer races of the lower and upper ball bearings 15 and 16 fit snugly within the holes 13 and are conned between lower cover plates 8u and upper cover plates 8|. The lower cover plates 8D are ring shaped and fit against the bottom end faces of the wheels I8 and the upper cover plates 8| are shaped to house the lock nuts 19 and bear or abut against the top end faces of 'the wheels. Vertically extending bolts 82 serve to clamp the cover plates 80 and 8I against the end faces of the wheels. These bolts, as shown in Figure 4, extend through aligned holes in the marginal portions of the lower and upper cover plates and other aligned holes in the portions of the wheels I8 that are directly outwards of the holes 13. The lower ends of the axles 12 extend through the central holes in the lower cover plates 15. They embody annular flanges 83 and have externally threaded lower extremities. The aides 12 are operatively connected to the crosshead I1 by way of a horizontally elongated block 84 and a pair of cylindrical members 85. The block rests on, and extends diametrically across the upper face of the crosshead I1 and is xedly secured to the crosshead by way or" the vertically extending bolts 56 (see Figures 2 and 4). The ends of the blocks are shaped to form single-split bearings 88 in which the cylindrical members 85 are mounted. The free ends of said bearings 86 are connected together by clamp bolts 81 which extend horizontally and are positioned and arranged as shown in Figure 7. When the bolts 81 are tightened they operate to contract the bearings 86 so that they secure the cylindrical members 85 against rotation or turning movement relatively thereto. When the clamp bolts 81 are loosened the members 85 are free and hence may be turned relatively to the bearings for purposes described hereinafter. The upper ends of the cylindrical members are provided with open top eccentrically disposed cylindrical sockets 88 in which the flanges 33 iit snugly. The axles are fixedly secured to the cylindrical members 85 by way of nuts 89 which are mounted on the threaded lower extremities of the lower ends of the axles and serve to clamp the flanges 83 in place within the sockets 88. By reason of the fact that the axles are eccentrically positioned with respect to the cylindrical members '85 turning of the members relatively to the bearings 86 causes the axles to move laterally and thus vary the spacing of the wheels I8 with respect to the upper track forming section 38 of the receptacle side wall 33. When it is desired to adjust the wheels I8 towards the upper section 38 the cylindrical members 85 are turned so as to move the axles 12 outwards with respect to the block 813. Should it be desired to increase the spacing of the wheels with respect to the upper track forming section 38 the cylindrical members 85 are turned so as to cause the axles 12 to move laterally inwards relatively to the block 84. As previously pointed out rotative adjustment of the members 85 is permitted by loosening the clamp bolts 81. After the members 85 are adjusted so that the wheels i8 are spaced the desired distance from the upper section 38 of the receptacle side wall the clamp bolts 81 are tightened in order to contract the bearings 86 around the members and thus lock the members against turning movement in the bearings. The axles 12, the cylindrical members 85 and the block 84 constitute or exemplify simple means whereby the position of the wheels I8 with respect to the inner periphery of the upper track forming section 38 may be readily adjusted. The upper ends of the cylindrical members 85 project above the upper or top face of the block 84 and are provided with diametrically opposite flats 90 whereby the members may be gripped by a wrench or other turning tool in connection with rotative adjustment thereof.

The Scrapers I9 serve by a scraping action to rid the outer peripheries of the wheels I8 of any material that adheres thereto and are located adjacent the trailing or, what may be termed, rear portions of theI wheels. They are horizontally elongated and have bevelled or knife-like iront ends. As best shown in Figure 7, the Scrapers I9 are located above the horizontally extending rotary crosshead I1 substantially midway between the center of the crosshead and the inner periphery of the upper track forming section 38 of the receptacle side wall and are carried by flat horizontally extending bracket plates 9|. The latter are substantially wedge shaped so far as contour or configuration is concerned and are arranged so that the small ends thereof extend inwards. The Scrapers I9 are welded to the front attacco `outerbornersof the bracket plates 9| yandthe latter are supported above the crosshead by way of a pair-of innerposts 92 vand afpair of outer posts`9`3. AS 'hereinafter described more in de- 4'tailjthebracketplatesare pivoted to swing horizontally -about the inner or Sma1l=ends -thereof in order vthat thelscrapers I9 may be-properly adjusted with respect lvtothe-outer peripheries of the wheels I8, Vrihe inner posts 92 are formed integrally '-with, Aand project upwards from, the 'crosshead |l and are arranged in straddled relation with the `central portion of the bar '34, as Shown inFigure V6. The inner ends of the bracket platesSl overlie the upper ends of the inner posts r92. Theyv are 'pivotally connected -to the latter by Way of verticallyextending pivot bolts "Stwhich, as shown in Figures, have polygonal heads at their upper `ends for turning purposes. The Shanks of the bolts *90 yextend through circular holes `95 in the inner enrfs of-the bracket plates 9| and havethe lower ends thereoffmounted in internally threaded-sockets 96 in the upper ends ofthe inner posts When the pivot bolts-94 are loosened the" bracket plates 59| 'may' be swung horizon-tally toor from the Awheels lIin order to -a'djust the lpositionof the Scrapers I9 with respect'to the Wheels. "lightening of the pivot bolts A`itresults -inlocking of the bracket plates =9-| 'intheir a'djustedposition. "The outer posts 93`are formed"integrally with, and'project upwardsffrom, theouter marginallportion ofthe circular or disc-like crosshea'd Il and have reduced upper ends '-93' which project labove the upper ends ofithel inner posts`92 and extendthrough arcuate slots 98 in the outer or large ends of the bracket-platesfSI. The-central portions of the outer postsd'em'body annularshoulders 99 which fracefupwar'ds and underlicthe slot defining portions of Fthe'bracket plates'l. The slots 198 are So'curved .or shaped thatthey permit the outer Y u orllarge endsfof the bracket plates to swing'laterally-'with 'respect to the-reduced upper ends 91 ofthe outer posts IYSS. "Clamp sleeves |09 are mountedfor vertical'sl-i'ding movement on the reduced upper yendsJS-'Ifof the outer posts 93 and have the lower endsthereof in abutment with the slot defining portions of the bracket .plates 9| .and-'their upper endsprojecting above the upper ends of the outerposts 93. VA barfIDI and alpairiof verticallyextending bolts |02 serve to urgethe clamp sleeves |90 downwards in order to exerteaclamping pressure onthe outer or large yendsfzof thef'clainp plates 9| and'assist the pivot bolts rSlflf inlocking the clamp plates in their: v arious :adjusted positions. .The bar lill extends horizont-allyandis arranged 4at an angle to the blockf'. The endsiof thebar |9I overlieand engage the upperfcnd ofV the clamp sleeves'lil andhave .circular holes I'BStherein. The clamp boltsl |02 have. polygonal headsfor :turning 4purposeattheir. upper ends. :The Shanks of the bolts exten-d-downwards-through the holes las into internally threaded sockets |04 in the upper reduced ends':9l of thenuter posts 93. When the bolts IY0I are'tightenedthebar |02'is shifted downwards and results in the clamp sleeves exerting ndownward clamping pressure on the outer-ends-of Ythe vbracket plates SI. is `desired` to `adjust the ScrapersI-Q with respect to the wheels it` the pivotl bolts 94 and the bolts |02 are .loosened-so asto release the bracket plates 0i. .Thereafter the bracket plates are swung-.horizontally in order to bring the Scrapers into 'proper or Vdesired position with respect 'to thesouteriperipheries of' the fwheels. After prop- When it' erly adjusting the Scrapers the pivot bolts 94 and the bolts |02 are tightened for purposes of locking the bracket with the plates 9| in place. The arcuate slots 98 of such plates are positioned concentrically Awith respect to the circular holes 95 at the inner or small ends of the bracket plates. In connection with drive of the crosshead the wheels I8 travel in acircular path in a clockwise direction as heretofore mentioned. In addition they rotate'in a counter-clockwise direction about the axles 'I2 therefor. As the wheels rotate about their' axles the Scrapers I9 operate to scrape from the Wheels material which adheres to the outer peripheries of the Wheels.

The Scrapers 29 are located outwardsvof the Scrapers I9 and behind the wheels I8 and serve 'duringr operation ofthe mill to scrape the inner periphery of the upper track forming section 38 of the receptacle side wall so as to preclude vaccumulationithereo-n of tire filler material that is compressed against said upper section 38 by the wheels I8. AS shown in Figure 8, the Scrapers 20 aretriangular in orderthat they effect scraping with a wedge action. A pair of horizontally' extending bracket plates |05 constitute the carrying or supporting means for the VScrapers 20. These bracket Plates extend substantially radiallyy outwards with respect'to the vaxis of the drive Shaft 54 for the rotary crosshead Vand have the Scrapers 20 welded to their outer ends. The inner portions of the bracket plates |05 underlie and Support the bracket plates 9| for the wheel scrapers I9. The inner ends of the bracket plates |05 rest on the upper ends of the inner posts 92 and have horizontally extending slots |05 through which the Shanks of the bolts 94`extend. The central portions of the bracket plates |05 rest on the upwardly facing annular shoulder99 on the central portions of the outer ,posts 93 and have longitudinallyextending slots I 0l through which the reduced upper ends Sl of the posts 93 extend. The slots |06 and |01 permit the bracket plates |05 to be adjusted longitudinally outwards or inwards in order properly to position the Scrapers 20 with respect to the inner periphery or" the upper track forming section l38 ofthe receptacle side wall-33. r.lightening of the pivot bolts 96 and the boltsI02 results in clamping of the bracket plates |95 in place. When it is desired longitudinally to adjust or shift Such plates for purposes of adjusting the Scrapers 29 with respect to the upper track forming section 38 the bolts 94 and |92 are loosened. When such bolts are-loosened'the bracketplates 9| as well as the bracket plates |05 Aare released and hence the Scrapers IS and the Scrapers 20 may be adjusted. Tightening of the bolts and |02 results in conjoint clamping in place of the bracket plates 9| and $05. 'lightening of the pivot bolts 94 results in the inner `ends'of thev bracket plates 9| andv |05 being clamped together against the upper ends of the inner posts 92 and tightening of the bolts |02 operates through the mediumof the barA |0| andtheolamp sleeves |90 to clamp the outer endsof the bracket plates '9| `andthe central por tions of the bracket-plates, |05 together against the'annular shoulder 99 on the central portions of theouter posts 93. The mounting means'for thcscrapers I9 and 25 are comparatively-simple and permit ready and conjoint adjustment of thc sera-pers upon loosening of the bolts 94 and |02.

The `plows 2| Yare located in front of the wheels I8 andserve during operation of themill to deflectbpwards into the path of the wheels the ller :and resinous -niaterials being processed.

They are disposed one diametrically opposite the other and are in the form of arcuate metallic plates. As best shown in Figures .1.0 and 1l, the plows 2| are arranged beneath and circumferentially with respect to the rotary crosshead I'I, directly overlie the bottom wall 32 of the receptacle I6, and are rearwardly and upwardly inclined. The width of the plows substantially cor responds to the Width of the annular space between the crosshead and the side wall of the receptacle. The outer side edges of the plows are curved conformably to the inner periphery of the receptacle side wall and are disposed directly inwards thereof. The front edges of the plows are located directly over the outer marginal portion of the receptacle bottom wall 32. A pair of L- shaped brackets |08 serves to connect the plows so that they revolve or rotate bodily with the crosshead. As shown in the drawings the brackets |08 comprise vertically extending legs |09 and laterally extending legs IIl. The vertically extending legs are welded to, and depend from, the marginal portion of the crosshead The other legs, i. e., the legs I I0, are connected to the lower ends of, and project outwards from, the vertical legs |09 and underlie the rear ends of the plows 2|. As shown in Figure ll, the legs IIC are inclined or canted upwards and rearwards in the same manner as the plows 2|. Bolts III extend through circular holes I I2 in the rear ends of ie plows and slots I I3 in the laterally extending legs IIO of the L-shaped brackets |08 and serve to connect the plows to the brackets. The slots I I3 extend transversely of the bracket legs I|0 and upon loosening of the bolts permits the plows to be adjusted forwards or rearwards in order to bring their front or leading edges into proper spaced relation with respect to the outer marginal portion of the receptacle bottom wall 32. Preferably the brackets |08 are of one-piece cliaractr. When it is desired to bring the front edges of the plows 2| nearer the receptacle bottom wall in order to compensate for wear the bolts |II are loosened and thereafter the plows are shifted or adjusted forwards. To increase the space of the front or leading edges of the plows the plows are adjusted rearwards after loosening of the bolts I I I. The plows are so arranged and inclined that in connection with operation of the mill they, as previously pointed out, deect upwards and rearwards into the circular path of travel of the wheels the materials being processed.

The scraper 22 has a twofold purpose in that it serves to scrape a sleeve |I4 around the upper end of the tubular member 28 and also to ilex outwards into the path of the plows 2| any material that accumulates under the rotary crosshead I'I. The sleeve II4 is fixedly secured in any suitable manner to the upper end of the tubular member 28 and extends between the crosshead II and the bottom wall 32 of the receptacle I6. The scraper 22 is in the form of a vertically extending horizontally elongated plate and extends substantially tangentially with respect to the sleeve II4. The inner end edge of the scraper is tapered so that it is knife-like in character in order that it serves effectively to scrape the outer periphery of the sleeve I4. The head of the scraper 22 corresponds substantially to that of the space between the crosshead IT and the bottom wall 32 of the receptacle. The arrangement or positioning of the scraper 22 is such that it extends outwards in a direction opposite to the direction of rotation of the cross-` head. A vertically extending plate-like bracket II5 serves to support the scraper 22 and connect it for conjoint rotation with the crosshead. This bracket is welded to, and depends from, the crosshead I'I, as shown in Figure 2 and ts against the outer end portion of the scraper 22. Rivets IIB extend through said rear end portion of the scraper and also through the bracket |I5 and serve fixedly to connect the scraper to the bracket. When the mill is in operation the scraper 22, as previously pointed out, operates to scrape the sleeve |I4 against the accumulation thereon of material and also delects outwards into the path of the plows 2| any material that tends to co1- lect on the portion of the receptacle bottom wall 32 that is under the rotary crosshead I1.

The chute 23 for introducing the ller material into the receptacle is in the form of a vertically extending duct which overlies the top wall 53 of the hood 52. The upper end of the chute is provided with a gate or slide valve (not shown) and leads to a hopper or other receptacle (also not shown) for the iiller material. The lower end of the chute is connected to the top wall of the hood and communicates with the interior of the hood by way of a hole in said top wall of the hood. It is contemplated that in connection with charging of the mill the aforementioned valve will be opened so as to permit of a downward discharge of a predetermined quantity of the filler material. The ller material falls by gravity through the interior of the dust hood and into the receptacle interior where it is subjected to the action of the wheels I8, the Scrapers I9, 20 and 22 and the plows 2|.

The pipe system for introducing the resinous material into the receptacle comprises a funnel II1, a tube II8, a cup-shaped header IIS and a pair of discharge pipes |20. The funnel I I1 comprises a cone shaped part |2| and a tube part |22 and for the most part extends centrally through the cylindrical shell 5I on the central portion of the top wall 53 of the dust hood 52. The cone shaped part I2I of the funnel rests on and serves to seal the upper end of the shell 6I, as shown in Figures 1. 2 and 5. The tube part |22 is of materially less diameter than the shell 6I and extends downwards through the shell and into the upper central portion of the dust hood 52. The tube IIB of the pipe system 24 extends vertically within the central portion of the hood and is arranged so that the upper end surrounds and is free from the lower end of the tube part of the funnel. The lower end of the tube IIB is xedly connected to, and communicates with the interior of, the header IIS. The latter rests on the central portion of the bar IOI and is xedly secured thereto by way of a vertically extending bolt |23 which, as shown in Figure 2, extends upwards through a hole in the central portion of the bar IOI into an internally threaded socket in the bottom wall of the header I I9. As a result of the fact that the hea-der IIS is connected to the bar'IDI the header together with the tube IIB rotates with the crosshead I1 during drive of the latter.

The discharge pipes |20 are disposed one diametrically opposite the other and are connected to, and radiate from, opposed portions of the side wall of the header IIS. The inner ends of the pipes |20 are suitably secured to such side portions of the header side wall and communicate with the interior of the header. The outer portions of the pipes |20 extend downwards as shown in Figure 5 and have the outer ends or extremities y.thereof disposed overtheplowsfZl. Iii-connection withvchargingof the mill the resinousamaterial that is'to bemixed and processed withl the filler materialdsA introduced into the funnel The material falls first .downwards intof-andfthrough the tube H8, then into the header |49, .and thence `outwards-and downwardsthrough the vdischarge pipes |20. After falling through the discharge pipes-the resinous material .is discharged over thel plows 2| and comes in contact with the fillerA material that is being deiiected by the plows into the circular path of travel of the wheels I8. As the result of ,the arrangement or positioning of the outeror discharge ends 4of .the pipes |20 the resinous material is introduced intothe iillerv material while the latter isin suspension adjacent the side wall .0f .the receptacle. To prevent entry of dust into the upper end of the tube ||8 an inverted cupshaped .shield |24 is provided. This shield comprises a centrally apertured top .Wall |25 which surrounds `and is welded to the central` portion of the tube. part |22 of the funnel VIt also comprises v.a depending cylindrical skirt |26 Whichsurrounds the upper end of `the `tube. H8, asshownin Figures 2 and 5.

In .connection with .fuse of. the mill the elec- `tric motor 69 is first started in order to effect driveof. the. crosshead` il through the medium of thepulleyand oelt connection land the vertically extending drive shaft 54. -Dn1fing rotation. of..the .crossheaddthewheels |8` travel in a vCirculancourse.or path around the upper track forming section .ofthe receptacle sidewall 33. After starting of the. mill. a predetermined amountv of filler material. is introduced into the receptacle. via .the valve controlled chute 23 which,v as. preiriously .pointedy out, has its lower .endlin communication with the interior ofthe hoodZ. After .the filler .material isl introduced into the receptacle .a,predetermined,quantity of the resinousmaterial that is .to..bemixed with the filler material is delivered .into the receptacle by way of the pipe .arrangement consistingof thefunnel HLthe tube |.|8, ythe `header H9, and the discharge pipes .l2-). yAs heretofore pointedoutthn. .resinous material enters thereceptacle interior directly over the YploWs.2-| and contactsgthe iiilorinaterial Vas the latterV isv=de lected .upwards .by the. plows irrto-.tl'ie path-.of thewheels. In connes-tion with operation of :the millthe '.llerinaterial ,with the resinous material intermixed therewith is vcompressed by the Wheels E8 againstthe upper section SSI-,of the sido Wall ofthereceptacle. -After Ibeing-compressed against .the vupper section theernixture .of jiiller and resinous yrrxaterials is scrape-d from the. inner periphery .of theupperside wall section-.33.. and .drops ,by gravity toward the bottem Waller the receptacle. Assoonas .thev mixture .drops tov a certain extent. itis engaged; by the .plowsand thrust Aupwards into the path of the .Wheels so thatit is againsubjected to compression .by the. wheels. Successive compressing and .deflecting oprations eiecta thorough 'mbiing ,ofthe resinous material with the yiller material vas well as compression of the mixture. The mixture is permitted to remain -in the mill until it `is processed to the A.desired or proper degree. At the conclusion of the -mixing and compressing opera-tion the Ydoor i? is swung outwards into its open. positionwtowthe zend :that theplows 2|,l connection with swinging thereo-f past the doorway-4|,reii`eot discharge .of the processed mixture' through theidoorwa-y. The

`Iniii-tnreas itleaves .the mill is in a so-calledv prekcured or partiallyv polymerized :state-and, after grinding, is in readiness or conditionV to be used .to form, by a molding operation, plasticl articles. During-operation of 'thefmill suctiontis applied to the duct E2 in'order to remove from the receptacle and hood Yinteriors water; vapor vand other. gases. Also during :operation i `of 4the mill ;either 'a fluid heating orl cooling; medium iswcirculated. through the -jacketf in order to effect' heating or cooling of the iimaterialswdurfing/'processingthereof, Within the receptacle.` of fthe mill. .''i" the resinous materialV is -inv powdered formi so thatv-heatis" required -tobringv it into the proper condition yforapplication toythe iillerpmaterialaa fluid heating .medium, suchas steam-or ahotfwater, is circulated through the jacket. f A Ona the other hand, if the resinousxma- -terialwfis in a diierent form; such as liquid'form and requires no l above atmospheric temperature, a cooling .'-medium;such. as arefrigerant-1 or: cold `.wat-er,-.is circulated through the: ja'cket'with the vi'eW-ofsdissipating `oriabsoroing the heatfrthat `is --created Ain s-oonnection 'f with 4.compression `of ther; ller= and resinous materials by the :wheels against then-.upper .track formingsection of .the receptacler sideewall. 1 It is contemplated that .lthescrosshead-.will-be driven yby Athe electricfmo.- tor :at vassperd off'approximately''i-R. 1P. M. 4Ati such` speed the plowsfserve' v to'v maintain the materials being processed f `inl suspension'. Within thereeeptacle The hereinadescribed milli effectively zand-emciently-fullls its -intendedfpurposeand l'is so designed `,andconstructed 1 that'it has a lcaniparatively longz'life and vrequires butzlittlemif any; servicing. It isA essentially simpl-e inadesignaand serves, lwhen used to; process llerf and -resinous:materiais,' te, process such :materials -in af single operation. Becausefof .thesmannerin which the wheels 48, vthe `Scrapers |9gand '20 andwthe.: plow-s 2 :arefmounted theymay be readilyfadjusted. p

I Whereas thefzmillf .hasfbeen describedY as being primarily for; use in processingiiller :and: resin.-

ouswmateria-lsfor,;purposes `of orrningin one operation thermosealing mixture that fis ica.- pableuof ibeingr-'molded-irrto 5p1astic' articles. it istobe vunderstood',"that they-mill 'may be ;used for other ;purposes,Y such,"for=eXample,-gas lmillingl therein plastic@ materals,` rubber, feto. It -is alsoiftobeunderstood that thefinvention is-"not .tof-,be:restricted` to the details set. forth-since theserzrnay befmodiied :within the "scopeof# the appended wclaims .without departing from :the spiritqand.' scope of thev invention. v

Having thus described the inventiozrwhatzwe claim was ifnewand desire-to secure ibyzLetters Patent :is:

1.2 In -af1mill-ofz the characterfldescribed, 'the combination `with a `bowl shaped receptacle adapted :to retain-.a batch ofmaterial to besprocessed 'fands embodying. a :bottcmewall and .a vcontinuous upstanding side wall lgan-d fa khorizontally extending cross-headzdisposed in thecentrallportion of the; receptacle, :mount-,edftorrotatezabout a. -verticalfzaxis-and provided withv :power :means forzdrivingit,A of a; block-like.:memberf'mounted Xeclly on` the ,zcrosshead and provided at vone sidefzofv thegaxisoffthe crosshead with an kintegral v'fertically extending cylindrical 'split' bearing Ywith-a single horizontal z clamp :bolt for drawingi` together the ffree end portions thereof, tra cylindrical .memberzclarnped .within vthe bear-ing,

adapted to mbe i turned `upon .loosening of .the

l clamp bolt and provided with a iixed vertically extending eccentrically disposed axle, and a horizontally extending wheel mounted rotatably on the axle and adapted during drive of the crosshead to travel in a circular course around the receptacle side wall and compress the material against the side wall.

2. In a mill of the character described, the combination with a bowl shaped receptacle adapted to retain a batch of material to be processed and embodying a bottom wall and a continuous upstanding side wall, and a horizontally extending disc-like crosshead disposed in the central portion of the receptacle, mounted to rotate about a vertical axis and provided with power means for driving it, of an elongated blocklike member mounted xedly on the top face thereof, and extending diametrically across, the crosshead and provided at its ends with integral cylindrical split bearings with horizontal clamping bolts for drawing together the free end portions thereof, a pair of cylindrical members clamped within the bearings, adapted to be turned upon loosening of the clamping bolts and provided with xed upwardly extending eccentrically disposed vertical axles, and a pair of horizontally extending and aligned wheels mounted on the axles and adapted during drive of the crosshead to travel in a circular course around the receptacle side wall and compress the material aganist said side wall.

3. A mill of the character described comprising a bowl shaped receptacle adapted to retain ra batch of material to be processed and embodying a circular bottom wall and a cylindrical upstanding sectional side wall comprising a rigid lower section having the lower end thereof connected to the outer marginal portion of the bottom wall and embodying outwardly extending apertured lugs at its upper end and a separately rigid upper section resting on the upper end of the lower section, having materially greater thickness than, but the same inside diameter as, the lower section and forming an annular track of appreciable thickness, bolts extending upwards through the apertured lugs and into the upper portion of the outer section and serving removably to secure said upper and lower sections together, a horizontally extending crosshead dis- -posed centrally within the receptacle mounted to rotate about a vertical axis and provided with power means for driving it, and a horizontally extending rotary wheel carried by the crosshead so that it is disposed adjacent the track and adapted during drive of the crosshead to travel around the track and to compress the material thereagainst.

4. A mill of the character described compris'- ing a bowl shaped receptacle adapted to retain a batch of material to be processed and embodying a circular bottom wall and a cylindrical upstanding sectional side wall comprising a rigid lower section having the lower end thereof connected to the outer marginal portion of the bottom wall and embodying flxedly outwardly extending apertured lugs at its upper end and a separately formed metallic upper section resting on the upper end of the lower section, having materially greater thickness than, but the same internal diameter as, the lower section and forming an annular track of appreciable thickness, bolts extending upwards through the apertured lugs and into the outer Iportion of the upper section and serving removably to connect said upper and lower sections together, a metallic ring shaped member of channel shaped cross section extending around, and connected to the upper section of the receptacle side wall, arranged to form an annular jacket around said upper section, provided with means whereby a uid medium may be circulated around the jacket and consisting or a cylindrical web of greater internal diameter than the diameter of the outer periphery of the upper section and horizontal anges formed integrally with, and extending inwards from, the ends of the web and having the inner edges thereof welded to said outer periphery of the outer section, a horizontally extending crosshead disposed centrally within the receptacle, mounted to rotate about a vertical axis and provided with power means for driving it, and a horizontally extending rotary wheel carried by the crosshead so that it is disposed adjacent the track and adapted during drive of the crosshead to travel around the track and to compress the material thereagainst.

5. A mill of the character described comprising a bowl shaped receptacle adapted to retain a batch of material to be processed and embodying a circular bottom wall and a cylindrical upstanding sectional side wall comprising a rigid lower section having the lower end thereof connected to the outer marginal portion of the bottom wall and a separately formed rigid upper section resting on, and removably secured to, the upper end of the lower section, having materially greater thickness than, but the same inside diameter as, the lower section and forming an annular track, an inverted cup-shaped dust hood disposed above the receptacle and comprising a circular top wall and a cylindrical side wall connected to, and depending from, the marginal portion of the last mentioned top wall, having substantially the same internal diameter as the upper section of the receptacle side wall, and embodying at its lower end an outwardly extending annularange resting on the upper end of said upper section, vertically extending bolts extending downwards through the ilange and into the outer` portion of the upper section and serving removably to secure the dust hood to said upper section, a horizontally extending crosshead disposed centrally within the receptacle mounted to rotate about a vertical axis and Iprovided with power means for driving it, and a horizontally extending rotary wheel carried by the crosshead so that it is disposed adjacent the tra-ck and adapted during drive of the crosshead to travel around the track and to compress the material thereagainst.

6. A mill of the character described comprising a bowl shaped receptacle adapted a retain a batch of material to be processed and embodying a bottom wall and a continuous upstanding side wall, a horizontally extending crosshead disposed in the central portion oi the receptacle, mounted to rotate about a vertical axis and provided with power means for driving it, a rotary horizontally extending wheel disposed above the crosshead and adjacent the side wall of the receptacle and carried by the crosshead so that in connection with drive of the latter it travels in a circular course around the receptacle side wall and compresses the material against said side wall, and a horizontally extending bracket plate disposed over the crosshead and adjacent the trailing portion of the wheel, provided with a scraper for the wheel and mounted on the crosshead so that it is bodily rotatable therewith while at the same time it is adjustable horizontally to 19 plate, provided with a scraper for the side wall of the receptacle and supported by said mount so that it is bodily rotatable with the crosshead while at the same time it is adjustable to and from the receptacle side wall in order to vary the position of its scraper with respect to said side wall, and common releasable means for locking the two bracket plates in their adjusted positions.

12. A mill of the character described comprising a bowl shaped receptacle adapted to retain a batch of material to be processed and embodying a bottom wall and a continuous upstanding side wall, a rotary horizontally extending crosshead disposed in the central portion of the receptacle, mounted to rotate about a vertical axis and provided with power means for driving it in one direction, a rotary horizontally extending wheel disposed above the crosshead and adjacent the side wall of the receptacle and carried by the crosshead so that during drive of the latter it travels in a circular course around the receptacle side wall and compresses the material thereagainst, a horizontally extending bracket plate disposed over the crosshead and adjacent the trailing portion of the wheel, provided with a scraper for the wheel and having associated therewith a mount whereby it is supported on the crosshead so that it is bodily rotatable therewith while at the same time it is capable of being swung laterally to and from the wheel in order to adjust the position of the scraper with respect to said wheel, a horizontally elongated second bracket plate tting against the rst mentioned bracket plate extending substantially radially with respect to the crosshead, provided at its outer end with a scraper for the receptacle side wall and supported by said mount so that it is bodily rotatable with the crosshead while at the same time it is longitudinally shiftable to and from the receptacle side wall in order to Vary the position of its scraper with respect to said side wall, and common releasable means for locking the two bracket platesin their various adjusted positions.

13. A mill of the character described comprising a bowl shaped receptacle adapted to retain a batch of material to be processed and embodying a bottom wall and a continuous upstanding side wall, a rotary horizontally extending crosshead disposed in the central portion of the receptacle, mounted to rotate about a vertical axis and provided With power means for driving it in one direction, a rotary horizontally extending wheel disposed above the crosshead and adjacent the side wall of the receptacle and carried by the crosshead so that during drive of the latter it travels in a circular course around the receptacle side wall and compresses the material thereagainst, a horizontal bracket plate disposed over and substantially radially with respect to the crosshead and adjacent the trailing portion of the wheel and provided at its outer end with a scraper for the wheel, a horizontally elongated second bracket plate disposed in abutting relation with the first mentioned bracket plate and substantially radially with respect to the crosshead and provided at its outer end with a scraper for the receptacle side wall, and a mount whereby the two bracket plates are connected for conjoint rotation with the crosshead, the iirst mentioned bracket plate is capable of being swung to and from the wheel in order to adjust the position of its scraper with respect to said wheel and the second bracket plate is slidable longitudinally to and from the receptacle side wall its upper end extending through a longitudinal slot in the central portion of said second bracket plate and through an arcuate slot in said rst mentioned bracket plate.

14. A mill of the character described comprising a bowl shaped receptacle adapted to retain a batch of material to be processed and embodyin'g a bottom wall and a continuous upstanding side wall, a horizontally extending disc-like crosshead disposed in the receptacle and above the central portion of the receptacle bottom wall, mounted to rotate about a vertical axis, provided with power means for driving it, embodying adjacent its outer marginal portion a pair of diametrically opposite upstanding axles and also embodying a pair of depending L-shaped brackets connectedl to, and depending from, said outer marginal portion of the crosshead, positioned diametrically opposite one another and at right angles to the axles and having the lower legs thereof extending outwards in the direction of the receptacle side wall, a pair of rotary horizontally extending wheels mounted on the axles and adapted in connection with drive of the crosshead to travel in a circular course around the circular side wall and compress the material against said side wall, and a pair of arcuate plows disposed directly above the outer marginal portion of the receptacle bottom wall and between the wheels, inclined downwards in the direction of drive of the crosshead, having the rear ends thereof connected to the bottom legs of the brackets and adapted in connection with drive of the crosshead to deilect the material upwards into the path of the wheels.

MURRAY G. CLAY. CHESTER J. SCANLAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 195,073 Appleby Sept, 11, 1877 263,927 Mahaffy Sept. 5, 1882 573,890 Mantley Dec. 29, 1896 938,923 Walker Nov. 2, 1909 1,334,701 Hurt Mar. 23, 1920 1,512,536 Hibbins Oct. 21, 1924 1,777,605 Dimler Oct. 7, 1930 2,170,303 Helstrup Aug. 22, 1939 2,226,023 Simpson Dec. 24, 1940 2,246,991 Beardsley June 24, 1941 2,306,422 Beardsley et al Dec. 29, 1942 2,318,797 Piper May 11, 1943 2,329,208 Lykken Sept. 14, 1943 2,385,767 Wagner Sept. 25, 1945 2,413,793 Sharp Jan. 7, 1947 FOREIGN PATENTS Number l Country Date 331,877 vGreat Britain July 10, 1930 

